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Plant function and evolutionary biology
RESEARCH ARTICLE

Effect of Uv Radiation on Endogenous Inhibitors of Growth in the Hypocotyl of Phaseolus vulgaris

H Kato-Noguchi and M Sumitomo

Australian Journal of Plant Physiology 21(2) 235 - 241
Published: 1994

Abstract

In order to correlate the role of endogenous inhibitors of growth of bean plants with the inhibition of such growth by UV radiation, a search for specific growth inhibitors was undertaken using the neutral and acidic fractions of acetone extracts from the hypocotyls of UV-irradiated bean seedlings (Phaseolus vulgaris L. cv. Morocco). Tho neutral and two acidic inhibitors were isolated and they were named N-1 and N-2 (neutral inhibitors) and A-1 and A-2 (acidic inhibitors), respectively, on the basis of the order of their elution from a silica-gel column.

Variations in the activity of the inhibitors in hypocotyls of two cultivars (cvv. Morocco and Kentucky 101) after the onset of UV radiation were determined by use of a bean bioassay, and results were compared with those of UV-induced inhibition of growth. The growth of hypocotyls of the two cultivars decreased rapidly. However, the more noticeable change was a marked decrease in the growth of the hypocotyls of cv. Morocco. On the other side, the difference in the activity of N-1 between the two cultivars was particularly great, and the changes with time in levels of N-1 in hypocotyls of each cultivar matched the time course of the UV-induced inhibition of growth of hypocotyls of the same cultivar. No such correlation was found with N-2, A-1 and A-2. These results suggest that the activity of N-1 may serve to distinguish the growth habit of the two cultivars to UV radiation.

https://doi.org/10.1071/PP9940235

© CSIRO 1994

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